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authorSebastian Ott <sebott@linux.vnet.ibm.com>2009-09-11 10:28:26 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-09-11 10:29:40 +0200
commit3b554a14f4bdf754ba9d2f64c2b6edf8dafe93b9 (patch)
treea01fc109cd60297d404e0e21f7457bd8e15f372b /drivers
parent6ee4fec6be06f7d138860b37cba58982cc3ccb16 (diff)
[S390] cio: move final put_device to ccw_device_unregister
We use a test_and_clear_bit to prevent a device from being unregistered twice. Unfortunately in this cases the "final" put_device (from device_initialize) was issued more than once, resulting in an use after free error. Fix this by moving this put_device to ccw_device_unregister. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/s390/cio/device.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 6b770f8c0a8..345a61f45a5 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -307,8 +307,11 @@ int ccw_device_is_orphan(struct ccw_device *cdev)
static void ccw_device_unregister(struct ccw_device *cdev)
{
- if (test_and_clear_bit(1, &cdev->private->registered))
+ if (test_and_clear_bit(1, &cdev->private->registered)) {
device_del(&cdev->dev);
+ /* Release reference from device_initialize(). */
+ put_device(&cdev->dev);
+ }
}
static void ccw_device_remove_orphan_cb(struct work_struct *work)
@@ -319,7 +322,6 @@ static void ccw_device_remove_orphan_cb(struct work_struct *work)
priv = container_of(work, struct ccw_device_private, kick_work);
cdev = priv->cdev;
ccw_device_unregister(cdev);
- put_device(&cdev->dev);
/* Release cdev reference for workqueue processing. */
put_device(&cdev->dev);
}
@@ -1358,7 +1360,6 @@ io_subchannel_remove (struct subchannel *sch)
cdev->private->state = DEV_STATE_NOT_OPER;
spin_unlock_irqrestore(cdev->ccwlock, flags);
ccw_device_unregister(cdev);
- put_device(&cdev->dev);
kfree(sch->private);
sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
return 0;